The auction, which had an estimated value of $50,000, ended on Tuesday, with a final bid of $610,000. Additional bank qualification was required for any bid of more than $500,000.

The lucky winning bidder is allowed to take one guest to meet Mr Cook, and the terms of the auction state that both people must "conduct themselves appropriately when attending an experience won at Charitybuzz. Polite manners and respect for the generous donor and adherence to any rules or parameters are a must."

Other auctions for the charity feature stars such as actor Robert De Niro, director Francis Ford Coppola and comedian Robin Williams.

"The RFK Center's annual auctions empower our human rights advocacy around the world, from courtrooms to classrooms, from Cambodia to California," said Kerry Kennedy, president of the RFK Center. "It's an honor to have so many stars from the worlds of business, media, entertainment, and sports helping us carry forward Robert Kennedy's dream of a more just and peaceful world."